With a forecast maximum of 43C for Sydney Olympic Park today, Tomic and Matosevic will either have to play through the heatwave or endure five matches in four days if the match is delayed until tomorrow.

The WTA Tour allows players to receive an extra 10-minute break in between the second and third set if the conditions are too severe, but have no regulations surrounding the stopping of play.

Under the WTA laws, extreme heat provisions can come into play when the Heat Stress Index reaches 30.1C or the ground temperature hits 34C and one of the players makes a complaint.

The ATP tour leaves that decision to the individual tournaments. The players' safety on court is determined by the Wet Bulb Globe Temperature, which assesses the temperature, humidity, wind speed and UV rays.

Matosevic said last night he was ready for the steamy conditions when he meets Tomic for the first time in an ATP Tour event.

"I'm looking forward to it. I want it to be as hot as possible tomorrow," he said.

"I don't want them to put the heat rule on. I want it to be as hot as possible. I've had a really good off season and I want to see where I'm at.

"I definitely can handle it. I want it to reach record temperatures. It was hot over in Perth as well, so (Bernard) will be used to it as well. I just really want to test myself ahead of the Australian Open.

"I hope it reaches 50C."

Tomic also said he was ready for the conditions after training in the heat yesterday.

"It's going to be hard," Tomic said.

"Hopefully it doesn't get too hard and I can stay hydrated."

Tournament organisers issued a statement yesterday in which they announced additional measures would be taken for players, spectators and staff, including an increase in the number of ice towels and umbrellas for players, free water and sunscreen for spectators, and an increase in first-aid staff in an air-conditioned heat stress area.

Marinko Matosevic in action during the Brisbane International last week. Picture: Chris HydeSource: Getty Images

"The organisers of the Apia International Sydney continuously monitor weather and environmental conditions to ensure the comfort and well-being of everyone associated with the tournament, including players, patrons and staff," the statement read.

"Should weather factors such as temperature, humidity, wind or precipitation threaten to adversely affect the tournament, organisers may introduce a mitigation strategy that could include adjustments to the match-play program."

Should the extreme heat cause delays, matches scheduled for Ken Rosewall Arena could be moved to an outside court to ensure Tomic and Matosevic are able to finish at a reasonable hour.

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